#include <cassert>
#include <chrono>
#include <cstdint>
#include <cstdlib>
#include <iostream>
#include <sstream>
#include <string>

#include "board/board.hpp"
#include "board/fen.hpp"
#include "hash.hpp"
#include "misc.hpp"
#include "moves.hpp"
#include "uci.hpp"

static void perft(int argc, char *argv[]) {
  if (argc < 4 || std::string(argv[1]) != "perft") {
    std::cout << "Usage: ./mono\n";
    std::cout << "       ./mono perft <non-negative depth> <fen>\n";
    exit(1);
  }

  uint32_t depth = 0;
  try {
    depth = static_cast<uint32_t>(std::stoi(argv[2]));
  } catch (const std::exception &) {
    std::cout << "info string usage: ./mono perft <non-negative depth>\n";
    exit(1);
  }

  std::string fen = argv[3];

  auto start = std::chrono::steady_clock::now();

  Game game = initBoard(fen, nullptr);
  uint64_t count = 0;
#ifdef PERFT_DIVIDE
  count = MoveGenTestDivide(depth, &game);
#else
  count = MoveGenTest(depth, &game);
#endif

  auto end = std::chrono::steady_clock::now();
  auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(end - start)
                .count();
  std::ostringstream oss;
  oss << "{\"ms\": " << ms << ", \"result\": " << count << "}";

  std::cout << oss.str() << "\n";
}

static void hashCmd(int argc, char *argv[]) {
  if (argc < 3) {
    std::cout << "Usage: ./mono hash <fen> [moves...]\n";
    exit(1);
  }

  std::string fen = argv[2];
  Game game = initBoard(fen, nullptr);

  for (int i = 3; i < argc; ++i) {
    uint16_t move = UciToMove(argv[i]);
    MakeMove(move, &game);
  }

  auto start = std::chrono::steady_clock::now();

  uint64_t hash = GenerateHashFromScratch(&game);
  auto end = std::chrono::steady_clock::now();
  auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(end - start)
                .count();
  std::ostringstream oss;
  oss << "{\"ms\": " << ms << ", \"hash\": " << hash << "}";

  std::cout << oss.str() << "\n";
}

int main(int argc, char *argv[]) {
  InitHashing();
  initMagicBitboards();

  if (argc >= 2 && std::string(argv[1]) == "perft") {
    perft(argc, argv);
    return 0;
  }

  if (argc >= 2 && std::string(argv[1]) == "hash") {
    hashCmd(argc, argv);
    return 0;
  }

  if (argc != 1) {
    std::cout << "Usage: ./mono \n";
    return 0;
  }
  std::cerr << engine_info();
  Uci();
  return 0;
}